On my natural draft tarm 502 I have 30 + feet of chimney. So much draft that I have inserted the turbulators( from the oil side that I dont use) one at a time.I now have all 6 turbs in the tubes. With 5 in I was seeing 5 to 600 degree stack temps, and had very good performance, very quick start ups and great heat retention. with all 6 in i see temp of 4 to 500 degrees. I just put the last one in tonite. I realize that a barometric damper is to control draft but I think the turbs really enhance performance. Would it be easier or better to "dial in " the ideal draft with a barometric damper with the turbs in place? I dont have a barometric damper in place now. I just cant seem to stop tinkering, tweaking etc.